Magnifying device



p 1942- K. MARTIN ETAL 2,297,232

MAGNIFYING DEVICE Filed Jan. 15, 1959 Fig.1

Fig. 6 0 CF 75: O 47 I 57 Inventor's 5 52 55 76 Karl Martin 52 54 46 29Friedrich M6'Ck8l Fi 7 Wilhelm Kaiser- 9 1V ,3 v ma A I I by AttdfneyPatented Sept. 29, 1942 UNITED sTsTas eATE-Nr OFFICE MAGNIFYING DEVICEKarl Martin, Friedrich Miickel, and Wilhelm Kaiser, Rathenow, Germany;vested in the Alien Property Custodian Application January 13, 1939,Serial No. 250,828 In Germany January 7, 1938 3 Claims. :{QCL 88-39)conditions where it is subjected to rough usage,

as for instance in work-shops and the like, where a man uses the lenswith a dirty hand or places it upon a dirty table. In order to attainthe object in view, we provide an elastic connection between the lens orits mount and the protective casing, that connection being so designedthat the casing is withdrawn from the lens in a positive manner, counterto the action of a spring, by the hand which takes hold of the lens withits protective casing in order to make use of it,

the lens is again covered with the protective casing by action of saidspring when the device is laid aside and the hand withdrawn.

Another object of the invention is to arrange the uncovering device forthe lens at the handle of the device so that this latter can bemanipulated with only one hand whereby the following particular andimportant advantage is obtained, viz.: An article to be examined isgenerally examined at first with the naked eye with respect to defectiveplaces, and if such a one has been found, then it is particularlyexamined with the aid of the magnifying lens. With the known magnifyinglenses with protective casing both hands must be used in order to removethe casing from the lens, and in many cases it is difficult to detectagain the faulty place, especially if the article of manufacture iscylindrical or spherical and tends, therefore, to roll away. Counterthereto, the one-hand magnifying lens with its protective casingaccording to this invention renders it possible to hold the article withthe other hand and to let the eyes dwell on the defective place eithercontinually or with short interruptions.

Still another object of the invention is to render the device able tostore a large portion of the power of the spring which tends to draw thelens back into the protective casing after it had been withdrawntherefrom for use, the hand of the operator being correspondinglyrelieved and the attention of the same being not deviated by the strainto which the muscles of his hand are otherwise subjected.

Further objects will appear while the invention 3 is described in detailin the following part of this specification.

The invention is illustrated diagrammatically and by way of examples onthe accompanying drawing on which Figure 1 is a plan of a constructionalform of the device,

Figure 2 is a section in the line A--B of Fig. 1, showing the device inits position of use,

Figure 3 is a partial view and shows a section through the middle of thedevice in the position of use 'of the same and in connection with theconstructional form illustrated in Fig. 1 and being intended for partlyrelieving the hand of the user,

Figure 4 is a view similar to Fig. 3 and shows a modification of adevice intended for the same purpose as that in Fig. 3, this modifieddevice being shown in its position of rest,

Figure 5 is a plan of another constructional form of the invention, theupper part of the casing being removed,

Figure 6 is a plan of the interior of still another constructional formof the invention, and Figure '7 is a section in the line CD of Fig. 6.Referring first to the Figs. 1 and 2, l denotes the casing of thedevice, 2 the mount of the lens, and 3 the lens itself. The casing isopen at its upper end and encloses the mount 2 which is so designed asto constitute a sliding member.

A helical spring 4 is attached at its end 4! to an eye of a pin llaifixed to the lower bottom of the casing I, and the other end 12 ofsaid spring is secured to the eye of a pin 2| attached to the lens mountin such a manner that the spring constantly tends to draw the lens withits mount 3 into the casing I. A grip 22 connected with the lens mountand designed as a rippled plate extends through a slot I2 of the casingand serves to move the lens out of the casing counter tothe action ofsaid spring. When said handle is let go the extended helical springcontracts so as to re-assume its former length and draws the lens backinto the said casing.

In the modification shown in Fig. 3 there the lens mount 2 is at theplace 23 which lies adjacent to the outer edge l3 when the lens has beenwithdrawn from the casing provided with a lug 23 that, owing to theobliquely downwardly acting pressure exerted by the operating fingerupon the grip 22 extends over the rim 13 of the back into the casing I.

casing and relieves, therefore, the hand from the tensile force of thespring. But in order to warrant that the lens is automatically withdrawninto the casing, a weak flat spring 24 is provided at the lens mount 2and abuts on the inner wall of the casing so as to tend to lift the lensmount in the direction to the grip 22. This is, however, prevented bythe finger that holds the device and need only overcome the force ofsaid weak spring.

The constructional form illustrated in Fig. 4 is, on principle, similarto that shown in Fig. 3

as regards the means for relieving the hand of the user of the device,but counter to Fig. 3 the lug 23 and the edge I3of the casing aredesigned not as vertically stepped surfaces, but as oblique surfaces,the inclination of which is such that when the grip 22 is let go thetensile force of the spring 4 overcomes the friction between the twooblique surfaces 22 and I3 so that the lens mount slides first upwardlyalongthe edge I3 and then into the casing I.

The magnifying device shown in Fig. 5 consists essentially of the sameparts as the constructional form shown in Fig. 1, viz. of the casing Iwhich is open at one of its sides, the lens mount 2, the lens 3, and thespring 4 which is secured in place between the casing and said mount.Withdrawing the lens from the casing is effected across a system oftransmission levers comprising a lever 25, the portion 22 of which isdesigned as a grip, and which is supported in a notch I4 of the casingthat constitutes the fulcrum of this lever, and comprising, furthermore,a connecting member 26 which is designed as a flat body, and a lever 21having unequally long arms and being turnable on a pivot I5 attached tothe casing, said lever co-operating by the intermediary of a slot 28with a pin 29 attached to the mount 2. When the lever 25 is depressed inthe direction to the closed bottom of the easing the longer arm of thetwo-armed lever 2'! will be moved upwardly and shift the lens mounttogether with the lens out of the casing. This casing consists in thisconstructional form of two parts which are connected with one another byscrew-threads and of which the upper one has been omitted in Fig. 5,

In the further constructional form shown in the Figs. 6 and 7 a devicedesigned in accordance with the principle of the Nuremberg scissors isused. 5| and 52 are two pressure levers which are supported on a pivotI6 attached to the casing; each of said levers acts upon a pivot 53, or54 respectively, attached to the first members of the Nuremberg scissors5, the individual members of which bear the reference numeral 55. Saidfirst or initial members of the Nuremberg scissors are turnably attachedto the casing by means of pivots I'I, whereas the last or end members 56and 5'! are affixed to the lens carrier 2 with the aid of pivots 29.

The device described in the preceding paragraph is actuated as follows:The hand to be used grasps around the casing I and presses upon thelevers 5I and 52 whereby the scissors will be expanded and the lenscarrier be shifted out of the casing. When the hand lets go said leversa return-spring (not shown for the sake of distinctness of the figure,and being for instance, designed similar to the spring 4 shown in Fig.2) becomes active and pulls the lens 3 Instead of a helical tensilespring like that just mentioned a compressive spring similar to such asused in connection with gardeners scissors can be used and arrangedbetween the two pressure levers 5| and 52.

We wish it to be understood that we do not limit ourselves to theconstructional forms of the improved magnifying device, as shown and'described, in that they are merely intended as examples. We claim asour invention all constructional forms falling within the scope of theannexed claims.

What we claim is:

1. A magnifying device comprising a casing, a. magnifying lens, a mountfor said lens, means for slidably supporting said mount in said casingfor moving said lens selectively into exposed position for use and intoan inoperative position in which said lens is covered by said casing,manually operable means attached to the mount and extending from saidcasing for slidably moving said mount into a position in which the lensis exposed, spring means attached to the mount and casing within saidcasing for returning said mount to its inoperative position in whichsaid lens is covered by said casing, cooperating holding means on saidcasing and mount for holding the latter relatively to the casing whenthe lens has been moved into its operative exposed position, and meansin the casing for automatically releasing the said holding means whensaid manually operable means is disengaged.

2. A magnifying device comprising a lens in a mount, a casing for saidmounted lens, a spring in said casing and connected to the latter andsaid mount respectively, for normally retaining said lens in itsinoperative position in which it is covered by said casing, a manuallyoperable member attached to one side of said mount for moving the latteroutwardly against the action of said spring into an extended position inwhich the lens is exposed for use, and a slanted projection on the otherside of said mount, which projection owing to the pressure exerted uponsaid manually operable means slips behind a corresponding slantedhoulder on said casing when said lens has been moved into its operativeposition, said spring being efiective to dislodge said mounted lens fromsaid shoulder and return the lens into its inoperative position withinsaid casing as soon as the pressure upon said manually operable memberis removed.

3. A magnifying device comprising a lens in a mount, a casing for saidmounted lens, a spring in said casing and connected to the latter andsaid mount respectively, for normally retaining said lens in itsinoperative position in which it is covered by said casing, a manuallyoperable member attached to said mount for moving the latter outwardlyagainst the action of said spring into an extended position in which thelens is exposed for use, a projection on said mount adapted to be urgedby said tensioned spring against a shoulder on said casing when the lenshas been moved into its exposed operative position, and a second springadapted to disengage said projection from said shoulder when saidmanually operable member is disengaged by the user of the device, sothat the first mentioned spring becomes effective to pull the mountedlens into said casing.

KARL MARTIN. FRIEDRICH MGCKEL. W'ILHELM KAISER,

